New Game :
After beating the game, you can start a new game and retain the items from your previous playthrough. You will also unlock Shirt 00.
Infinite battery power:
To unlock Infinite battery power, beat the game and then purchase the energy saving part for the Tsubaki MkIII for 999,999 LB from Naomi.
Assassination missions:
To unlock the Assassination mission, complete the odd jobs at the Job Center.
Bitter difficulty:
To unlock Bitter difficulty, complete the game on Sweet or Mild difficulty.
Pure White Giant Glastonbury mini-game:
To unlock the Pure White Giant Glastonbury mini-game, select your television at the motel and win the Rank 04 battle.
Alternate ending:
To receive an alternate ending, beat the game with all Beam Katanas.
Motorcycle controls:
Perform the following motorcycle controls by performing the corresponding actions with the Wii-mote:
CONTROL – HOW TO PERFORM
Jump – Tilt the Wii-mote up while at full speed.
Quick turn – Quickly hit the brakes while tilting the Wii-mote to the side.
Easy Health/Power:
Right before the bosses are usually two boxes with health and a battery recharger. Collect them and then enter a save room, and they will reappear when you return.